Compensating device



G. 0. GRAY. -COMPENSATING DEVICE. APPLICATION F|LED"DEC.3, 1920.

Patented Jan. 31, 1922;

2 SHEETSQSHEET I.

- I/VVENTOR .6 M G 0 v Mmm T T A G. O. GRAY. COMPENSATING DEVICE'.

APPLICATION FILED DEC. 3,1920. 7

Patented Jan. 31,1922.

2 SHEETS-SHEET 2- INVENTOR 0.Gfi-Ar,

I A TTOR/VEYS To all whom it may camera esonan -oars GRAY, or BUTT MO TANA.

" lfcomrsr sk'rrne DEVICE, p

Application fileiddDeceinter$119261:SrialNoAfZSJtS. M

Be it knownthat I GnonanQ. Gretta a citizen or at United states, and areas-em of Butte, inth'e county of-"Silverbowjand State of Montana, have invented 'certaiii new and useful lm 'arove'ments in Gompen eating Devices, of which the following isa specification." i

My invent on is an improvement in comlw l t li'g i es, nd-ha o t obj t; a provide I a device of the character specified, especially adapted .for 'i se with chart dis play apparatus, for compensating for dif; ference in speed due to the unequalsiie of therollers while the, chart is winding from one and winding on the other.

In the drawings:

Figure 1 is a horizontal section,

Figure 2 is a section on the line 2-2 of Figure l,

Figure 3 is a side view of the pinion support,

Figure 4 is a section through one of the friction gears.

In the present embodiment of the invention, the chart rollers indicated at 1 and 2 are journaled in a suitable case 3 which has at one end a partition 4: forming a chamber for the compensating mechanism between the said partition and the adjacent end of the casing. Each of the rollers 1 and 2 has a shaft 5, and each roller carries a pinion 6 at the end adjacent to the partition.

These pinions 6 are adapted to be engaged by pinions 7 on the end of a cross head 8 which is frictionally held to the driving shaft 9 for the chart rollers. This shaft 9 extends through the end of the casing 3, and is provided with a knurled knob 10 for con venience in turning the same. The cross head is so arranged that but one of the pinions 7 may be engaged with a pinion 6, the other pinion being moved out of engagement when one pinion is moved into engagement.

When the shaft 9 is turned in either direction, the cross head 8 will be swung to cause a pinion 7 to engage that chart roller 1 or 2 as the case may be from which the chart is unwinding, and to brake the movement of the roller.

The chart rollers are driven from the shaft 9, by means of mechanism shown be tween the end of the casing and the partition 4 in Figure 1. This mechanism comprises a hub 11 which is keyed to the shaft 9, and which carries in recesses 12 near its 'Specificatioaiof "Letters Patent, Patented Jan, 31, 1922.

periphery conical pinions' 13, the said pinions being journaled ona'xes indicated at 14 andradial to the shaft 9. fThe pini'ons 13' engage annular series of bevel gear teeth on disks 15 and '16 which are journaledonlthe shaft 9on opposite sides of the hub 11. The respective-gear wheels 15 and 16 drive the shafts ofthe rollers 1 and 2 throifghpinions '17 on theshafts of the rollers 1 and 2, andidlers18 interposed between theshafts 17 and the gear wheels 15 and 16. A sle'eve or bushing'19 isf arranged-be-' tween the shaft 9*ai1dthe endof'the' casing, and thisbushingis engaged by abearing on a bracket 20$ nut21 is threaded onto the bushing outside of the baringfto prevent disengagement of the bracket.

In operation, when it is desired to move the chart in either direction, the knob 10 is turned. If the knob is turned in a direction to wind the chart on the roller 1, that is, to move the chart upward in Figure 1, the friction brake will be applied to the chart 2, and the chart 1 will rotate freely, while the chart roller 2 will be braked or retarded.

The gear wheels 15 and 16 are held frictionally on the shaft 9, so that when a roller 1 or 2 is braked, the gear wheel corresponding thereto may slip on the shaft 9. Thus there will be compensation for the difference in speed of the rollers due to the variation in size. I

The cross head is not only frictionally held on the shaft 9, but the pinions 7 are frictionally mounted on the cross head. As shown in Figure 4, each of these pinions is mounted between the arms 22 of a fork on the end of the cross head, and the arms are resilient so that they may move toward and from each other to clamp upon or loosen the pinion.

A. screw 23 passes through the arm and through the pinion and through washers 24: on each side of the pinion, and is engaged by a nut 25 on the outer side of one arm. By turning the nut friction may be increased or diminished.

It will be noticed that the frictional connection between the shaft 9 and the cross head is by means of a block 26, which is arranged within the bearing of the cross head, and it may be pressed against the shaft with more or less friction, by means of a set rollers, of a common operating means for turning the said rollers to wind the chart on one and to unwind thechartifromrthe other, compensating mechanism arranged between the operating means and the rollers for permitting a differential movement between said rollers, said compensating mechanism comprising a differential connection between the rollers, and a brake for one roller controlled to engage the roller from which the chart is unwinding by the movement of the operating means, said braking 7 means comprising a cross head eonnecte with the operatmgmeans to. SWIIIO' toward of said driving member and engaged .by

said pinions, and means operatively connectin said ear wheels and said rollers.

3.1T e com ination with a pair of rollers, of an operating shaft therefor, a driving --memberrigidly secured on said shaft and having pinions, gear wheels on opposite sides:

of said driving member and engaged by said pinions, means operatively connecting said gear wheels and said rollers, and brakin means mounted on and operated by sai shaft.

4. The combination with a pair of rollers, of an operating shaft therefor, a driving member T-keyed on said shaft, gear wheels 'frictionally mounted on said shaft on opposite SldGS of said dIlVlIlg member, means operat1vely connecting said dr'1v ng me1n-' her and .sald gear w els, andrjgearsrconnected to said rollers and meshing with said gear wheels, a display strip connected to said rollers, and braking means mounted on said operating shaftgand a friction member engaging the shaft.

GEORGE ORIE GRAY. 

